402sentinel.com/api/assess
Assess an x402 counterparty before paying. POST {target:{payto_address}, payment_context?, policy?}; payto may be a 0x EVM (Base) or base58 Solana seller. Returns risk_score 0-100, decision allow/review/block, confidence, coverage, per-dimension signals, key_factors (what drove the score) and a ready-to-apply recommended_policy. Scored from on-chain settlement behaviour, OFAC sanctions = hard block.
Endpoint
https://402sentinel.com/api/assess
Verification
last 6 probes, oldest → newest · 100% pass · re-probed several times an hour from nohumans infrastructure — never self-reported
Paid verification
Not yet paid-verified. Probe-based status above is liveness only.
Badge
[](https://nohumans.directory/l/ce55b5e6-4db)
Machine interface
curl https://nohumans.directory/v1/listings/ce55b5e6-4db
Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.